diff --git a/pyproject.toml b/pyproject.toml
index 7acf8bb8b1..d681d1bfca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -70,6 +70,8 @@ validobj = "*"
 prompt_toolkit = "*"
 frozendict = "*"  # validphys: needed for caching of data loading
 # Reportengine (and its dependencies) need to be installed in a bit more manual way
+# the version of RE that we need requires curio, and the pypi package for curio is no longer updated
+curio = { git = "https://github.com/dabeaz/curio", rev = "8667999" }
 reportengine = { git = "https://github.com/NNPDF/reportengine", rev = "3bb2b1d"}
 ruamel_yaml = {version = "<0.18"}
 # Fit